MCQ practice · SSC Chemistry Board questions · Chapter 6: Concept of Mole and Chemical Counting
What is the volume in liters of 5 grams of hydrogen gas at the standard condition?
Think it through first, then pick an option.
- a 22.4
- b 56
- c 112
- d 122
Answer and explanation
Correct answer: b 56
n = 5/2 = 2.5 mole; V = 2.5 × 22.4 = 56 L.
Why the other options are wrong
- a 22.4: 22.4 L is 1 mole, 2 g of H₂; 5 g = 2.5 mole = 56 L.
- c 112: 112 L is the volume of 10 g of H₂; 5 g takes half, 56 L.
- d 122: 122 L fits no mole count; 5 g of H₂ = 56 L.
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